How to call method after click using javascript

Question

I have a button click event where I added javascript confirmation box (Yes / No). I want to make when the user click yes the method will run. Here is the sample:

Asp.Net C# Backend:

Response.Write("<script>var confirmdelete=confirm('No chronological event found.Do you want to continue ?');if (confirmdelete) {('<%=ASPxButton_Approve%>').valueof()}</script>");

ASPxButton_Approve = is the button I will trigger

after that it will show yes no confirmation box. I want to make it when the user will click yes below method will run:

approve();

sadhana kadam · Accepted Answer · 2016-10-12 06:20:05Z

1

on button clientclick only you can write

eg.

 <asp:Button ID="btnSubmit" class="btn btn-success waves-effect waves-light" TabIndex="5" ValidationGroup="validate" formnovalidate="formnovalidate" runat="server" Text="Submit" OnClientClick="if (Page_ClientValidate()){ return confirm('Do you want to add task? Click OK to proceed.')}" OnClick="btnSubmit_Click" />

answered Oct 12, 2016 at 6:20

sadhana kadam

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Comments

Alessandro · Accepted Answer · 2016-10-12 06:31:35Z

You could use OnClientClick attribute, in your frontend file put a button like this:

<asp:LinkButton ID="lnkDelete" runat="server" CausesValidation="false" 
CommandName="Delete" CommandArgument="optionalParameterLikeAKey" 
OnCommand="lnkDelete_Command" OnClientClick="return confirm('No 
chronological event found.Do you want to continue ?');" Text="Delete">

And in code behind catch the action command "Delete":

void lnkDelete_Command(Object sender, CommandEventArgs e) {
    //Code to delete -> e.CommandArgument;
}

Alternatively you could use:

<a href="YourPage.aspx?ID=<%#DataBinder.Eval(Container.DataItem, "ID")%>&action=delete" onclick="return confirm('No 
chronological event found.Do you want to continue ?');">Delete</a>

I hope it helps.

Rajeesh Menoth · Accepted Answer · 2016-10-12 08:01:01Z

I recommend you to make a javascript function and use CustomValidatorin ASP.NET which is a strong ability to handle client side codes.

To create custom validation logic on the client
Create a validation function in ECMAScript (JavaScript, JScript): The following code example illustrates custom client-side validation. An excerpt from the page shows a TextBox control referenced by a CustomValidator control. The validation control calls a client script function named validateLength to make sure that the user has entered at least eight characters into the TextBox control.

A Typical example:

<script type="text/javascript">
   function validateLength(oSrc, args){
   args.IsValid = (args.Value.length >= 8);
}
</script>

The C# code:

<asp:Textbox id="text1" runat="server" text=""></asp:Textbox>
<asp:CustomValidator id="CustomValidator2" runat="server" 
ControlToValidate = "text1"
ErrorMessage = "You must enter at least 8 characters!"
ClientValidationFunction="validateLength" >
</asp:CustomValidator>

For more information go on here.

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